Merge branch 'dev' of https://github.com/backengineering/llvm-msvc into dev

Author: gmh5225

clang/tools/driver/version.h

@@ -1 +1 @@
-#define CLANG_LLVM_MSVC_VERSION "v3.2.0"
+#define CLANG_LLVM_MSVC_VERSION "v3.2.1"

lld/COFF/InputFiles.cpp

@@ -1059,6 +1059,12 @@ void BitcodeFile::parse() {
     } else {
       sym = ctx.symtab.addRegular(this, symName, nullptr, fakeSC, 0,
                                   objSym.isWeak());
+      // Model all symbols with the __imp_ prefix as having external
+      // references. If one LTO object defines a __imp_<foo> symbol, and
+      // another LTO object refers to <foo> with dllimport, make sure the
+      // __imp_ symbol is kept.
+      if (symName.starts_with("__imp_"))
+        sym->isUsedInRegularObj = true;
     }
     symbols.push_back(sym);
     if (objSym.isUsed())