[NFC][clang] Inclusive language: rename master variable to controller in debug-info tests

[quinnp]

Summary

[NFC] As part of using inclusive language within the llvm project, this patch
replaces master with controller in these tests.

[quinnp]

Changing master to controller in another testcase.

clang/test/CodeGenObjC/debug-info-block-helper.m

 // REQUIRES: x86-registered-target
 // RUN: %clang_cc1 -emit-llvm -fblocks -debug-info-kind=limited -triple x86_64-apple-darwin10 -fobjc-runtime=macosx-fragile-10.5 %s -o - | FileCheck %s
 extern void foo(void(^)(void));
 
 // CHECK: !DISubprogram(linkageName: "__destroy_helper_block_8_32o40r48r"
 
 @interface NSObject {
   struct objc_object *isa;
 }
 @end
 
 @interface A:NSObject @end
 @implementation A
 - (void) helper {
- int master = 0;
+ int controller = 0;
  __block int m2 = 0;
  __block int dbTransaction = 0;
  int (^x)(void) = ^(void) { (void) self; 
-  (void) master; 
+  (void) controller; 
   (void) dbTransaction; 
   m2++;
   return m2;
 
   };
-  master = x();
+  controller = x();
 }
 @end
 
 void foo(void(^x)(void)) {}