ci: add msan Linux job

MSan is viral, so it is added to Clang only.

Do not add MSan to MacOS job, since it is not supported in that platform.

Author: mizvekov

.github/workflows/ci.yml

@@ -42,7 +42,7 @@ jobs:
           latest-factors: |
             msvc Optimized-Debug
             gcc UBSan Coverage
-            clang UBSan ASan
+            clang UBSan ASan MSan
             apple-clang UBSan ASan
           factors: ''
           runs-on: |
@@ -280,6 +280,7 @@ jobs:
           # The LLVM_USE_SANITIZER option doesn't support GCC.
           extra-args: |
             -DLLVM_USE_SANITIZER=${{ matrix.llvm-sanitizer-config }}
+            -DLLVM_OPTIMIZED_TABLEGEN=ON
           cc: ${{ steps.setup-cpp.outputs.cc }}
           cxx: ${{ steps.setup-cpp.outputs.cxx }}
           ccflags: -gz=zstd