When looking for a linker, 32-bit clang-cl.exe wants to use the 32-bit-native link.exe located in Hostx86/x86, but this executable does not exist in our releng package, because we only use 64-bit-host toolchains.

This patch makes clang-cl use the Hostx64/x86 linker instead. Ideally we wouldn't be using 32-bit clang-cl.exe in the first place. Bug 1414287 is on file to do so and remove this hack.

diff --git a/clang/lib/Driver/ToolChains/MSVC.cpp b/clang/lib/Driver/ToolChains/MSVC.cpp
--- a/clang/lib/Driver/ToolChains/MSVC.cpp
+++ b/clang/lib/Driver/ToolChains/MSVC.cpp
@@ -817,8 +816,7 @@
   switch (Type) {
   case SubDirectoryType::Bin:
     if (VSLayout == ToolsetLayout::VS2017OrNewer) {
-      const bool HostIsX64 =
-          llvm::Triple(llvm::sys::getProcessTriple()).isArch64Bit();
+      const bool HostIsX64 = true;
       const char *const HostName = HostIsX64 ? "HostX64" : "HostX86";
       llvm::sys::path::append(Path, "bin", HostName, SubdirName);
     } else { // OlderVS or DevDivInternal