[WebAssembly] Temporarily disable bulk-memory with -pthread

[tlively]

Summary

To prevent the instability of bulk-memory in the wasm backend from
blocking separate pthread testing, temporarily remove the logic that
adds -mbulk-memory in the presence of -pthread. Since browsers will
ship bulk memory before or alongside threads, this change will be
reverted as soon as bulk memory has stabilized in the backend.

lib/Driver/ToolChains/WebAssembly.cpp

 
 void WebAssembly::addClangTargetOptions(const ArgList &DriverArgs,
                                         ArgStringList &CC1Args,
                                         Action::OffloadKind) const {
   if (DriverArgs.hasFlag(clang::driver::options::OPT_fuse_init_array,
                          options::OPT_fno_use_init_array, true))
     CC1Args.push_back("-fuse-init-array");
 
-  // '-pthread' implies '-target-feature +atomics' and
-  // '-target-feature +bulk-memory'
+  // '-pthread' implies '-target-feature +atomics'
   if (DriverArgs.hasFlag(options::OPT_pthread, options::OPT_no_pthread,
                          false)) {
     if (DriverArgs.hasFlag(options::OPT_mno_atomics, options::OPT_matomics,
                            false))
       getDriver().Diag(diag::err_drv_argument_not_allowed_with)
           << "-pthread"
           << "-mno-atomics";
-    if (DriverArgs.hasFlag(options::OPT_mno_bulk_memory,
-                           options::OPT_mbulk_memory, false))
-      getDriver().Diag(diag::err_drv_argument_not_allowed_with)
-          << "-pthread"
-          << "-mno-bulk-memory";
     CC1Args.push_back("-target-feature");
     CC1Args.push_back("+atomics");
-    CC1Args.push_back("-target-feature");
-    CC1Args.push_back("+bulk-memory");
-  }
-
-  // '-matomics' implies '-mbulk-memory'
-  if (DriverArgs.hasFlag(options::OPT_matomics, options::OPT_mno_atomics,
-                         false)) {
-    if (DriverArgs.hasFlag(options::OPT_mno_bulk_memory,
-                           options::OPT_mbulk_memory, false))
-      getDriver().Diag(diag::err_drv_argument_not_allowed_with)
-          << "-matomics"
-          << "-mno-bulk-memory";
-    CC1Args.push_back("-target-feature");
-    CC1Args.push_back("+bulk-memory");
   }
 }
 
 ToolChain::RuntimeLibType WebAssembly::GetDefaultRuntimeLibType() const {
   return ToolChain::RLT_CompilerRT;
 }
 
 ToolChain::CXXStdlibType

test/Driver/wasm-toolchain.c

 
 // A basic C compile command-line with known OS.
 
 // RUN: %clang -### -no-canonical-prefixes -target wasm32-unknown-wasi-musl --sysroot=/foo %s 2>&1 | FileCheck -check-prefix=COMPILE %s
 // COMPILE: clang{{.*}}" "-cc1" {{.*}} "-internal-isystem" "/foo/include/wasm32-wasi-musl" "-internal-isystem" "/foo/include"
 
 // Thread-related command line tests.
 
-// '-pthread' sets '-target-feature +atomics' and '-target-feature +bulk-memory'
+// '-pthread' sets '-target-feature +atomics'
 // RUN: %clang -### -no-canonical-prefixes -target wasm32-unknown-unknown --sysroot=/foo %s -pthread 2>&1 | FileCheck -check-prefix=PTHREAD %s
-// PTHREAD: clang{{.*}}" "-cc1" {{.*}} "-target-feature" "+atomics" "-target-feature" "+bulk-memory"
+// PTHREAD: clang{{.*}}" "-cc1" {{.*}} "-target-feature" "+atomics"
 
 // '-pthread' not allowed with '-mno-atomics'
 // RUN: %clang -### -no-canonical-prefixes -target wasm32-unknown-unknown --sysroot=/foo %s -pthread -mno-atomics 2>&1 | FileCheck -check-prefix=PTHREAD_NO_ATOMICS %s
 // PTHREAD_NO_ATOMICS: invalid argument '-pthread' not allowed with '-mno-atomics'
-
-// '-pthread' not allowed with '-mno-bulk-memory'
-// RUN: %clang -### -no-canonical-prefixes -target wasm32-unknown-unknown --sysroot=/foo %s -pthread -mno-bulk-memory 2>&1 | FileCheck -check-prefix=PTHREAD_NO_BULKMEM %s
-// PTHREAD_NO_BULKMEM: invalid argument '-pthread' not allowed with '-mno-bulk-memory'
-
-// '-matomics' not allowed with '-mno-bulk-memory'
-// RUN: %clang -### -no-canonical-prefixes -target wasm32-unknown-unknown --sysroot=/foo %s -matomics -mno-bulk-memory 2>&1 | FileCheck -check-prefix=ATOMICS_NO_BULKMEM %s
-// ATOMICS_NO_BULKMEM: invalid argument '-matomics' not allowed with '-mno-bulk-memory'

test/Preprocessor/wasm-target-features.c

 
 // RUN: %clang -E -dM %s -o - 2>&1 \
 // RUN:     -target wasm32-unknown-unknown -matomics \
 // RUN:   | FileCheck %s -check-prefix=ATOMICS
 // RUN: %clang -E -dM %s -o - 2>&1 \
 // RUN:     -target wasm64-unknown-unknown -matomics \
 // RUN:   | FileCheck %s -check-prefix=ATOMICS
 //
-// ATOMICS-DAG:#define __wasm_atomics__ 1{{$}}
-// ATOMICS-DAG:#define __wasm_bulk_memory__ 1{{$}}
+// ATOMICS:#define __wasm_atomics__ 1{{$}}
 
 // RUN: %clang -E -dM %s -o - 2>&1 \
 // RUN:     -target wasm32-unknown-unknown -pthread \
 // RUN:   | FileCheck %s -check-prefix=PTHREAD
 // RUN: %clang -E -dM %s -o - 2>&1 \
 // RUN:     -target wasm64-unknown-unknown -pthread \
 // RUN:   | FileCheck %s -check-prefix=PTHREAD
 //
-// PTHREAD-DAG:#define __wasm_atomics__ 1{{$}}
-// PTHREAD-DAG:#define __wasm_bulk_memory__ 1{{$}}
+// PTHREAD:#define __wasm_atomics__ 1{{$}}
 
 // RUN: %clang -E -dM %s -o - 2>&1 \
 // RUN:     -target wasm32-unknown-unknown -mcpu=mvp \
 // RUN:   | FileCheck %s -check-prefix=MVP
 // RUN: %clang -E -dM %s -o - 2>&1 \
 // RUN:     -target wasm64-unknown-unknown -mcpu=mvp \
 // RUN:   | FileCheck %s -check-prefix=MVP
 //