Initialize ProgramConfig in SkSL unit tests.

This CL fixes-forward ASAN errors in these tests:

 	start unit test  SkSLMemoryLayoutTest_std430

 C:\b\s\w\ir\win_toolchain/VC/Tools/MSVC/14.29.30133/include\memory:3382:36: runtime error: load of value 3, which is not a valid value for type 'bool'
Change-Id: I8c5eb8a68cd04deb90b31aa985dff584115bd003
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/806016
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed