[ASan] Moved optimized callbacks out of asan_static to avoid DSO size increase.

[vitalybuka]

LGTM, but maybe we can chat about that later today

clang/lib/Driver/ToolChains/CommonArgs.cpp

if (SanArgs.needsHwasanRt() && SanArgs.linkRuntimes()) {
         HelperStaticRuntimes.push_back("hwasan-preinit");
     }
   }
 
   // The stats_client library is also statically linked into DSOs.
   if (SanArgs.needsStatsRt() && SanArgs.linkRuntimes())
     StaticRuntimes.push_back("stats_client");
 
-  // Always link the static runtime regardless of DSO or executable.
-  if (SanArgs.needsAsanRt())
-    HelperStaticRuntimes.push_back("asan_static");
-
   // Collect static runtimes.
   if (Args.hasArg(options::OPT_shared)) {
     // Don't link static runtimes into DSOs.
     return;
   }
 
   // Each static runtime that has a DSO counterpart above is excluded below,
   // but runtimes that exist only as static are not affected by needsSharedRt.

clang/test/Driver/sanitizer-ld.c

 // CHECK-ASAN-NO-LINK-RUNTIME-LINUX-NOT: libclang_rt.asan-x86_64
 
 // RUN: %clang -fsanitize=address %s -### -o %t.o 2>&1 \
 // RUN:     -target x86_64-unknown-linux -fuse-ld=ld \
 // RUN:     -resource-dir=%S/Inputs/resource_dir \
 // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-ASAN-EXECUTABLE-LINUX %s
 //
-// CHECK-ASAN-EXECUTABLE-LINUX: libclang_rt.asan_static-x86_64
 // CHECK-ASAN-EXECUTABLE-LINUX: libclang_rt.asan-x86_64
 
 // RUN: %clang -fsanitize=address -shared %s -### -o %t.o 2>&1  \
 // RUN:     -target x86_64-unknown-linux -fuse-ld=ld \
 // RUN:     -resource-dir=%S/Inputs/resource_dir \
 // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-ASAN-SHARED-LINUX %s
 //
-// CHECK-ASAN-SHARED-LINUX: libclang_rt.asan_static-x86_64
 // CHECK-ASAN-SHARED-LINUX-NOT: libclang_rt.asan-x86_64
 
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     -target i386-unknown-linux -fuse-ld=ld -fsanitize=address -shared-libsan \
 // RUN:     -resource-dir=%S/Inputs/resource_dir \
 // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-SHARED-ASAN-LINUX %s
 

compiler-rt/lib/asan/CMakeLists.txt

set(ASAN_SOURCES
   asan_stats.cpp
   asan_suppressions.cpp
   asan_thread.cpp
   asan_win.cpp
   )
 
 if (NOT WIN32 AND NOT APPLE)
   list(APPEND ASAN_SOURCES
+    asan_rtl_x86_64.S
     asan_interceptors_vfork.S
     )
 endif()
 
 set(ASAN_CXX_SOURCES
   asan_new_delete.cpp
   )
 
 set(ASAN_STATIC_SOURCES
   asan_rtl_static.cpp
   )
 
 if (NOT WIN32 AND NOT APPLE)
   list(APPEND ASAN_STATIC_SOURCES
-    asan_rtl_x86_64.S
   )
 endif()
 
 set(ASAN_PREINIT_SOURCES
   asan_preinit.cpp
   )
 
 SET(ASAN_HEADERS

compiler-rt/lib/asan/asan_rtl_x86_64.S

 CLABEL(reg, op, 1, i): ;\
         push   %rcx ;\
         mov    %##reg,%rcx ;\
         and    $0x7,%ecx ;\
         cmp    %r10d,%ecx ;\
         pop    %rcx ;\
         jl     RLABEL(reg, op, 1, i);\
         mov    %##reg,%rdi ;\
-        jmp    __asan_report_##op##1_asm ;\
+        jmp    __asan_report_##op##1 ;\
 
 #define ASAN_MEMORY_ACCESS_EXTRA_CHECK_2(reg, op, i) \
 CLABEL(reg, op, 2, i): ;\
         push   %rcx ;\
         mov    %##reg,%rcx ;\
         and    $0x7,%ecx ;\
         add    $0x1,%ecx ;\
         cmp    %r10d,%ecx ;\
         pop    %rcx ;\
         jl     RLABEL(reg, op, 2, i);\
         mov    %##reg,%rdi ;\
-        jmp    __asan_report_##op##2_asm ;\
+        jmp    __asan_report_##op##2 ;\
 
 #define ASAN_MEMORY_ACCESS_EXTRA_CHECK_4(reg, op, i) \
 CLABEL(reg, op, 4, i): ;\
         push   %rcx ;\
         mov    %##reg,%rcx ;\
         and    $0x7,%ecx ;\
         add    $0x3,%ecx ;\
         cmp    %r10d,%ecx ;\
         pop    %rcx ;\
         jl     RLABEL(reg, op, 4, i);\
         mov    %##reg,%rdi ;\
-        jmp    __asan_report_##op##4_asm ;\
+        jmp    __asan_report_##op##4 ;\
 
 #define ASAN_MEMORY_ACCESS_CALLBACK_ADD_1(reg, op) \
 BEGINF(reg, op, 1, add) ;\
         ASAN_MEMORY_ACCESS_INITIAL_CHECK_ADD(reg, op, 1) ;\
         ASAN_MEMORY_ACCESS_EXTRA_CHECK_1(reg, op, add) ;\
 ENDF
 
 #define ASAN_MEMORY_ACCESS_CALLBACK_ADD_2(reg, op) \
#define ASAN_MEMORY_ACCESS_CHECK_ADD(reg, op, s, c) \
         shr    $0x3,%r10 ;\
         ##c    $0x0,ASAN_SHADOW_OFFSET_CONST(%r10) ;\
         jne    FLABEL(reg, op, s, add) ;\
         retq  ;\
 
 #define ASAN_MEMORY_ACCESS_FAIL(reg, op, s, i) \
 FLABEL(reg, op, s, i): ;\
         mov    %##reg,%rdi ;\
-        jmp    __asan_report_##op##s##_asm;\
+        jmp    __asan_report_##op##s##;\
 
 #define ASAN_MEMORY_ACCESS_CALLBACK_ADD_8(reg, op) \
 BEGINF(reg, op, 8, add) ;\
         ASAN_MEMORY_ACCESS_CHECK_ADD(reg, op, 8, cmpb) ;\
         ASAN_MEMORY_ACCESS_FAIL(reg, op, 8, add) ;\
 ENDF
 
 #define ASAN_MEMORY_ACCESS_CALLBACK_ADD_16(reg, op) \