Revert "add operator "" _mask() to make Assembler clearer"
Revert "add operator "" _mask() to make Assembler clearer"

This reverts commit 076e5d3a4c26c30d23fa01ecc783552fb9b3bc6d.

Reason for revert: breaking google3. "literal operators are an unapproved C++11 feature"

Original change's description:
> add operator "" _mask() to make Assembler clearer
> 
> Change-Id: I145f0f60288eef368fc7648b25661356cb6e9f12
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/223980
> Commit-Queue: Mike Klein <mtklein@google.com>
> Reviewed-by: Herb Derby <herb@google.com>

TBR=mtklein@google.com,herb@google.com

Change-Id: Ib41aa871c2e8b9b27fb75b73e538729c9ab24112
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/224076
Reviewed-by: Greg Daniel <39df0a804564ccb6cf75f18db79653821f37c1c5@google.com>
Commit-Queue: Greg Daniel <39df0a804564ccb6cf75f18db79653821f37c1c5@google.com>

google/skia,aosp-mirror/platform_external_skia,google/skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,HalCanary/skia-hc,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,HalCanary/skia-hc,HalCanary/skia-hc,google/skia,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,HalCanary/skia-hc,google/skia,HalCanary/skia-hc,HalCanary/skia-hc,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,HalCanary/skia-hc