[Test] Trim unnecessary .c and .cpp from config.suffix in lit.local.cfg

Tested by comparing make check VERBOSE=1 before and after to make sure
no tests are missed.  (VERBOSE=1 prints the list of tests.)

Only one test :( remains where .cpp is required:

tools/llvm-cov/range_based_for.cpp:// RUN: llvm-cov range_based_for.cpp | FileCheck %s --check-prefix=STDOUT

The topic was discussed in this thread:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20140428/214905.html

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208621 91177308-0d34-0410-b5e6-96231b3b80d8

test/Analysis/Delinearization/lit.local.cfg

@@ -1 +1 @@
-config.suffixes = ['.ll', '.c', '.cpp']
+config.suffixes = ['.ll']

test/CodeGen/ARM64/lit.local.cfg

@@ -1,6 +1,6 @@
 import re
 
-config.suffixes = ['.ll', '.c', '.cpp']
+config.suffixes = ['.ll']
 
 targets = set(config.root.targets_to_build.split())
 if not 'ARM64' in targets:

test/CodeGen/X86/lit.local.cfg

@@ -4,7 +4,7 @@
 #
 # It should be possible to remove this override once all the bots have cycled
 # cleanly.
-config.suffixes = ['.ll', '.c', '.cpp', '.test', '.txt']
+config.suffixes = ['.ll', '.test', '.txt']
 
 targets = set(config.root.targets_to_build.split())
 if not 'X86' in targets:

test/MC/ARM64/lit.local.cfg

@@ -1,4 +1,4 @@
-config.suffixes = ['.ll', '.c', '.cpp', '.s']
+config.suffixes = ['.ll', '.s']
 
 targets = set(config.root.targets_to_build.split())
 if not 'ARM64' in targets:

test/Transforms/LoopVectorize/AArch64/lit.local.cfg

@@ -1,4 +1,4 @@
-config.suffixes = ['.ll', '.c', '.cpp']
+config.suffixes = ['.ll']
 
 targets = set(config.root.targets_to_build.split())
 if not 'AArch64' in targets:

test/Transforms/LoopVectorize/ARM64/lit.local.cfg

@@ -1,4 +1,4 @@
-config.suffixes = ['.ll', '.c', '.cpp']
+config.suffixes = ['.ll']
 
 targets = set(config.root.targets_to_build.split())
 if not 'ARM64' in targets:

test/tools/llvm-cov/lit.local.cfg

@@ -1 +1 @@
-config.suffixes = ['.test', '.m', '.c', '.cpp']
+config.suffixes = ['.test', '.m', '.cpp']