[JITLink] Silence some MSVC implicit cast warnings.

llvm-svn: 358824

Author: lhames

llvm/lib/ExecutionEngine/JITLink/JITLink_MachO_x86_64.cpp

@@ -227,7 +227,7 @@ class MachOAtomGraphBuilder_x86_64 : public MachOAtomGraphBuilder {
           AtomToFix = &*AtomToFixOrErr;
         }
 
-        if (FixupAddress + (1 << RI.r_length) >
+        if (FixupAddress + static_cast<JITTargetAddress>(1 << RI.r_length) >
             AtomToFix->getAddress() + AtomToFix->getContent().size())
           return make_error<JITLinkError>(
               "Relocation content extends past end of fixup atom");
@@ -290,7 +290,8 @@ class MachOAtomGraphBuilder_x86_64 : public MachOAtomGraphBuilder {
         case PCRel32Minus1Anon:
         case PCRel32Minus2Anon:
         case PCRel32Minus4Anon: {
-          JITTargetAddress Delta = 1 << (*Kind - PCRel32Minus1Anon);
+          JITTargetAddress Delta =
+              static_cast<JITTargetAddress>(1 << (*Kind - PCRel32Minus1Anon));
           JITTargetAddress TargetAddress =
               FixupAddress + 4 + Delta + *(const ulittle32_t *)FixupContent;
           if (auto TargetAtomOrErr = G.findAtomByAddress(TargetAddress))