Index: lib/Driver/ToolChains/MSVC.cpp
===================================================================
--- lib/Driver/ToolChains/MSVC.cpp
+++ lib/Driver/ToolChains/MSVC.cpp
@@ -506,7 +506,7 @@
     // its containing bin directory at the top of PATH, followed by the
     // native target bin directory.
     // e.g. when compiling for x86 on an x64 host, PATH should start with:
-    // /bin/HostX64/x86;/bin/HostX64/x64
+    // /bin/Hostx64/x86;/bin/Hostx64/x64
     // This doesn't attempt to handle ToolsetLayout::DevDivInternal.
     if (TC.getIsVS2017OrNewer() &&
         llvm::Triple(llvm::sys::getProcessTriple()).getArch() != TC.getArch()) {
@@ -848,7 +848,7 @@
     if (VSLayout == ToolsetLayout::VS2017OrNewer) {
       const bool HostIsX64 =
           llvm::Triple(llvm::sys::getProcessTriple()).isArch64Bit();
-      const char *const HostName = HostIsX64 ? "HostX64" : "HostX86";
+      const char *const HostName = HostIsX64 ? "Hostx64" : "Hostx86";
       llvm::sys::path::append(Path, "bin", HostName, SubdirName);
     } else { // OlderVS or DevDivInternal
       llvm::sys::path::append(Path, "bin", SubdirName);