Remove VISIBILITY_HIDDEN from class/struct found inside anonymous namespaces.
Chris claims we should never have visibility_hidden inside any .cpp file but
that's still not true even after this commit.

llvm-svn: 85042
diff --git a/llvm/lib/Target/X86/X86FloatingPointRegKill.cpp b/llvm/lib/Target/X86/X86FloatingPointRegKill.cpp
index 3e0385c..19f5d80 100644
--- a/llvm/lib/Target/X86/X86FloatingPointRegKill.cpp
+++ b/llvm/lib/Target/X86/X86FloatingPointRegKill.cpp
@@ -30,7 +30,7 @@
 STATISTIC(NumFPKill, "Number of FP_REG_KILL instructions added");
 
 namespace {
-  struct VISIBILITY_HIDDEN FPRegKiller : public MachineFunctionPass {
+  struct FPRegKiller : public MachineFunctionPass {
     static char ID;
     FPRegKiller() : MachineFunctionPass(&ID) {}