[SuperFileCheck] Consider regex helpers

[TIHan]

At the moment in SuperFileCheck, we use FileCheck's syntax for matching registers using regexes:

// ARM64: cmp {{x[0-9]+}}, {{x[0-9]+}}

// X64: mov [[REG0:[a-z0-9]+]], [[REG1:[a-z0-9]+]]

This does hurt readability. We should consider creating built-in helpers at the SuperFileCheck level that expand common regexes to make this easier to write and read. An example of what this might look like:

// ARM64: cmp {{$(REGISTER)}}, {{$(REGISTER)}}

// X64: mov [[REG0:$(REGISTER)]], [[REG1:$(REGISTER)]]

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Issue Details

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At the moment in SuperFileCheck, we use FileCheck's syntax for matching registers using regexes:

// ARM64: cmp {{x[0-9]+}}, {{x[0-9]+}}

// X64: mov [[REG0:[a-z0-9]+]], [[REG1:[a-z0-9]+]]

This does hurt readability. We should consider creating built-in helpers at the SuperFileCheck level that expand common regexes to make this easier to write and read. An example of what this might look like:

// ARM64: cmp {{$(REGISTER)}}, {{$(REGISTER)}}

// X64: mov [[REG0:$(REGISTER)]], [[REG1:$(REGISTER)]]

Author:	TIHan
Assignees:	-
Labels:	area-Infrastructure-coreclr
Milestone:	-

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