Fix even more Clang warnings.

This patch disables shift-sign-overflow warnings for now. It also
fixes most -Wfloat-equal warnings and -Wextra-semi warnings.

llvm-svn: 343438
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 0b485f3e911e946da4ecac73544116df2bd4dae1
diff --git a/include/regex b/include/regex
index db15f78..1858500 100644
--- a/include/regex
+++ b/include/regex
@@ -1352,9 +1352,9 @@
     virtual ~__node() {}
 
     _LIBCPP_INLINE_VISIBILITY
-    virtual void __exec(__state&) const {};
+    virtual void __exec(__state&) const {}
     _LIBCPP_INLINE_VISIBILITY
-    virtual void __exec_split(bool, __state&) const {};
+    virtual void __exec_split(bool, __state&) const {}
 };
 
 // __end_state