[-Wunsafe-buffer-usage][NFC] Format AST matcher in isInUnspecifiedPointerContext

...and turn off clang-format for the block of AST matchers.

Author: jkorous-apple

clang/lib/Analysis/UnsafeBufferUsage.cpp

@@ -281,10 +281,13 @@ isInUnspecifiedPointerContext(internal::Matcher<Stmt> InnerMatcher) {
   // 4. the operand of a pointer subtraction operation
   //    (i.e., computing the distance between two pointers); or ...
 
-  auto CallArgMatcher =
-      callExpr(forEachArgumentWithParamType(InnerMatcher,
-                  isAnyPointer() /* array also decays to pointer type*/),
-          unless(callee(functionDecl(hasAttr(attr::UnsafeBufferUsage)))));
+  // clang-format off
+  auto CallArgMatcher = callExpr(
+    forEachArgumentWithParamType(
+      InnerMatcher, 
+      isAnyPointer() /* array also decays to pointer type*/),
+    unless(callee(
+      functionDecl(hasAttr(attr::UnsafeBufferUsage)))));
 
   auto CastOperandMatcher =
       castExpr(anyOf(hasCastKind(CastKind::CK_PointerToIntegral),
@@ -306,6 +309,7 @@ isInUnspecifiedPointerContext(internal::Matcher<Stmt> InnerMatcher) {
 			   hasRHS(hasPointerType())),
 		     eachOf(hasLHS(InnerMatcher),
 			    hasRHS(InnerMatcher)));
+  // clang-format on
 
   return stmt(anyOf(CallArgMatcher, CastOperandMatcher, CompOperandMatcher,
 		    PtrSubtractionMatcher));