Remove 24 instances of 'REQUIRES: shell'

Tests fall into one of the following categories:

- The requirement was unnecessary

- Additional quoting was required for backslashes in paths (see "sed -e
  's/\\/\\\\/g'") in the sanitizer tests.

- OpenMP used 'REQUIRES: shell' as a proxy for the test failing on
  Windows. Those tests fail there reliably, so use XFAIL instead.

I tried not to remove shell requirements that were added to suppress
flaky test failures, but if I screwed up, we can add it back as needed.

llvm-svn: 284793
diff --git a/clang/test/OpenMP/task_firstprivate_codegen.cpp b/clang/test/OpenMP/task_firstprivate_codegen.cpp
index 0d8e1c4..b177293 100644
--- a/clang/test/OpenMP/task_firstprivate_codegen.cpp
+++ b/clang/test/OpenMP/task_firstprivate_codegen.cpp
@@ -7,7 +7,7 @@
 // expected-no-diagnostics
 // REQUIRES: x86-registered-target
 // It doesn't pass on win32.
-// REQUIRES: shell
+// XFAIL: win32
 #ifndef ARRAY
 #ifndef HEADER
 #define HEADER