tools: repair Windows build

exp2 is not available on Windows.  Fortunately, we are calculating powers of 2
with expontents within the range of [4,12].  Simply use an equivalent bitshift
operation to repair compilation with MSVC which does not provide this standard
function.

llvm-svn: 200454

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/tools/llvm-readobj/ARMAttributeParser.cpp b/llvm/tools/llvm-readobj/ARMAttributeParser.cpp
index a9f6a2eba61..26b8f6e91ac 100644
--- a/llvm/tools/llvm-readobj/ARMAttributeParser.cpp
+++ b/llvm/tools/llvm-readobj/ARMAttributeParser.cpp
@@ -321,7 +321,7 @@ void ARMAttributeParser::ABI_align_needed(AttrType Tag, const uint8_t *Data,
   if (Value < countof(Strings))
     Description = StringRef(Strings[Value]);
   else if (Value <= 12)
-    Description = Twine("8-byte alignment, ") + utostr(exp2(Value))
+    Description = Twine("8-byte alignment, ") + utostr(1 << Value)
                 + Twine("-byte extended alignment");
   else
     Description = "Invalid";
@@ -342,7 +342,7 @@ void ARMAttributeParser::ABI_align_preserved(AttrType Tag, const uint8_t *Data,
   if (Value < countof(Strings))
     Description = StringRef(Strings[Value]);
   else if (Value <= 12)
-    Description = Twine("8-byte stack alignment, ") + utostr(exp2(Value))
+    Description = Twine("8-byte stack alignment, ") + utostr(1 << Value)
                 + Twine("-byte data alignment");
   else
     Description = "Invalid";