support 7 args in skvm::Program::eval()

On x86_64 we cap out at 6 arguments for JITing, but on arm64 we support
up to 7.  This change avoids the assert when running SkSLInterpreter
unit tests that do hit 7 arguments.

Cq-Include-Trybots: luci.skia.skia.primary:Test-Android-Clang-Pixel-CPU-Snapdragon821-arm64-Debug-All-Android,Test-Android-Clang-Pixel-CPU-Snapdragon821-arm64-Debug-All-Android_ASAN
Change-Id: I17383679fb9bce2e4ce052bcac3c694e5af77124
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/353537
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed