Minor fix to rotation helpers so they don't do undefined shifts.

Probably not a big deal realistically, but better to be safe than sorry.



git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@1725 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Core/Common/Src/Common.h

@@ -131,10 +131,14 @@ extern "C" {
 
 #if !defined(_WIN32)
 inline u32 _rotl(u32 x, int shift) {
+    shift &= 31;
+    if (!shift) return x;
     return (x << shift) | (x >> (32 - shift));
 }
 
 inline u32 _rotr(u32 x, int shift) {
+    shift &= 31;
+    if (!shift) return x;
     return (x >> shift) | (x << (32 - shift));
 }