[CMake] Add the gyb target 'swift-parse-syntax-generated-headers' to LLVM_COMMON_DEPENDS

Since the generated headers are in 'include/swift/Parse' they are globally accessible so make sure they are created early on.
If these get moved inside 'lib/Parse' then we can remove this dependency setting.

Author: akyrtzi

lib/CMakeLists.txt

@@ -12,6 +12,7 @@ list(APPEND LLVM_COMMON_DEPENDS intrinsics_gen clang-tablegen-targets)
 
 # Add generated libSyntax headers to global dependencies.
 list(APPEND LLVM_COMMON_DEPENDS swift-syntax-generated-headers)
+list(APPEND LLVM_COMMON_DEPENDS swift-parse-syntax-generated-headers)
 
 add_subdirectory(AST)
 add_subdirectory(ASTSectionImporter)