cd to a temporary directory for 3c -dump-stats commands.

Author: mattmccutchen-cci

clang/test/3C/json_formating.c

@@ -1,5 +1,8 @@
+// RUN: rm -rf %t*
+// RUN: mkdir %t.alltypes && cd %t.alltypes
 // RUN: 3c -base-dir=%S -alltypes -dump-stats -dump-intermediate -debug-solver %s
 // RUN: python -c "import json, glob; [json.load(open(f)) for f in glob.glob('*.json')]"
+// RUN: mkdir %t.noalltypes && cd %t.noalltypes
 // RUN: 3c -base-dir=%S -dump-stats -dump-intermediate -debug-solver %s
 // RUN: python -c "import json, glob; [json.load(open(f)) for f in glob.glob('*.json')]"
 

clang/test/3C/statstest.c

@@ -1,6 +1,7 @@
 // RUN: rm -rf %t*
-// RUN: 3c -dump-stats -base-dir=%S -alltypes -addcr %s -- 2>%t.stderr | FileCheck -match-full-lines %s
-// RUN: FileCheck -match-full-lines -check-prefixes="CHECK_STDERR" --input-file %t.stderr %s
+// RUN: mkdir %t && cd %t
+// RUN: 3c -dump-stats -base-dir=%S -alltypes -addcr %s -- 2>stderr | FileCheck -match-full-lines %s
+// RUN: FileCheck -match-full-lines -check-prefixes="CHECK_STDERR" --input-file %t/stderr %s
 
 
 #include <stdlib.h>