Remove redundant casts. NFC

So I wrote a clang-tidy check to lint out redundant `isa`, `cast`, and
`dyn_cast`s for fun. This is a portion of what it found for clang; I
plan to do similar cleanups in LLVM and other subprojects when I find
time.

Because of the volume of changes, I explicitly avoided making any change
that wasn't highly local and obviously correct to me (e.g. we still have
a number of foo(cast<Bar>(baz)) that I didn't touch, since overloading
is a thing and the cast<Bar> did actually change the type -- just up the
class hierarchy).

I also tried to leave the types we were cast<>ing to somewhere nearby,
in cases where it wasn't locally obvious what we were dealing with
before.

llvm-svn: 326416

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index 84e74ad5058..473da22e9b4 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -237,7 +237,7 @@ static unsigned getDeclShowContexts(const NamedDecl *ND,
   IsNestedNameSpecifier = false;
 
   if (isa<UsingShadowDecl>(ND))
-    ND = dyn_cast<NamedDecl>(ND->getUnderlyingDecl());
+    ND = ND->getUnderlyingDecl();
   if (!ND)
     return 0;