Merging r309112:

Merging r309112:
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r309112 | yamaguchi | 2017-07-26 06:30:36 -0700 (Wed, 26 Jul 2017) | 7 lines

[Bash-completion] Fixed a bug that file doesn't autocompleted after =

Summary:
File path wasn't autocompleted after `-fmodule-cache-path=[tab]`, so
fixed this bug by checking if $flags contains only a newline or not.

Differential Revision: https://reviews.llvm.org/D35763
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_50@309435 91177308-0d34-0410-b5e6-96231b3b80d8