[PATCH] Fix for #pragma warning to work correctly with "1-4:" specifiers

[Andrey Bokhanko]

Updated patch has these checks:

// CHECK: #pragma warning(pop)
#pragma warning(1: 123)
// CHECK: #pragma warning(1: 123)
#pragma warning(2: 234 567)
// CHECK: #pragma warning(2: 234 567)
#pragma warning(3: 123; 4: 678)
// CHECK: #pragma warning(3: 123)
// CHECK: #pragma warning(4: 678)
#pragma warning(5: 123) // expected-warning {{expected 'push', 'pop', 'default', 'disable', 'error', 'once', 'suppress', 1, 2, 3, or 4}}


http://reviews.llvm.org/D9856

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