Revert "[release] Use the Bootstrapping build for building LLVM releases"

[ldionne]

Summary

This reverts commit c8bb1777fff5d1ae28a2deac0d6677e081d4200f to fix
https://github.com/llvm/llvm-project/issues/54154 on the release branch.

[ldionne]

In case we are unable to fix the underlying issue for https://github.com/llvm/llvm-project/issues/54154, this is a revert of c8bb177 based on the release/14.x branch. It's late here, but if someone wants to apply it tonight, it should apply conflict-less.

[ldionne]

Closing since this has been landed on release/14.x:

commit 33e5c90c9d53b666e04ee7874f3f8fc74f3a758c (HEAD -> release/14.x)
Author: Louis Dionne <[e-mail]>
Date:   Tue Mar 8 18:10:04 2022 -0500

    Revert "[release] Use the Bootstrapping build for building LLVM releases"

    This reverts commit c8bb1777fff5d1ae28a2deac0d6677e081d4200f to fix
    https://github.com/llvm/llvm-project/issues/54154 on the release branch.

llvm/utils/release/test-release.sh

if [ -z "$NumJobs" ]; then
     NumJobs=3
 fi
 
 # Projects list
 projects="llvm clang"
 if [ $do_clang_tools = "yes" ]; then
   projects="$projects clang-tools-extra"
 fi
-runtimes=""
 if [ $do_rt = "yes" ]; then
-  runtimes="$runtimes compiler-rt"
+  projects="$projects compiler-rt"
 fi
 if [ $do_libs = "yes" ]; then
-  runtimes="$runtimes libcxx"
+  projects="$projects libcxx"
   if [ $do_libcxxabi = "yes" ]; then
-    runtimes="$runtimes libcxxabi"
+    projects="$projects libcxxabi"
   fi
   if [ $do_libunwind = "yes" ]; then
-    runtimes="$runtimes libunwind"
+    projects="$projects libunwind"
   fi
 fi
 if [ $do_openmp = "yes" ]; then
   projects="$projects openmp"
 fi
 if [ $do_lld = "yes" ]; then
   projects="$projects lld"
 fi
case $Flavor in
         * )
             echo "# Invalid flavor '$Flavor'"
             echo ""
             return
             ;;
     esac
 
     project_list=${projects// /;}
-    runtime_list=${runtimes// /;}
     echo "# Using C compiler: $c_compiler"
     echo "# Using C++ compiler: $cxx_compiler"
 
     cd $ObjDir
     echo "# Configuring llvm $Release-$RC $Flavor"
 
     echo "#" env CC="$c_compiler" CXX="$cxx_compiler" \
         cmake -G "$generator" \
         -DCMAKE_BUILD_TYPE=$BuildType -DLLVM_ENABLE_ASSERTIONS=$Assertions \
         -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
         -DLLVM_ENABLE_PROJECTS="$project_list" \
         -DLLVM_LIT_ARGS="-j $NumJobs" \
-        -DLLVM_ENABLE_RUNTIMES="$runtime_list" \
         $ExtraConfigureFlags $BuildDir/llvm-project/llvm \
         2>&1 | tee $LogDir/llvm.configure-Phase$Phase-$Flavor.log
     env CC="$c_compiler" CXX="$cxx_compiler" \
         cmake -G "$generator" \
         -DCMAKE_BUILD_TYPE=$BuildType -DLLVM_ENABLE_ASSERTIONS=$Assertions \
         -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
         -DLLVM_ENABLE_PROJECTS="$project_list" \
         -DLLVM_LIT_ARGS="-j $NumJobs" \
-        -DLLVM_ENABLE_RUNTIMES="$runtime_list" \
         $ExtraConfigureFlags $BuildDir/llvm-project/llvm \
         2>&1 | tee $LogDir/llvm.configure-Phase$Phase-$Flavor.log
 
     cd $BuildDir
 }
 
 function build_llvmCore() {
     Phase="$1"