machinst: label ISA-specific changes as such
"cranelift":
- "cranelift/**"
-"cranelift:area:aarch64":
+"cranelift:area:machinst":
- "cranelift/codegen/src/machinst/**"
+
+"cranelift:area:aarch64":
- "cranelift/codegen/src/isa/aarch64/**"
+"cranelift:area:x64":
+ - "cranelift/codegen/src/isa/x64/**"
+
"cranelift:area:peepmatic":
- "cranelift/peepmatic/**"
- "cranelift/codegen/src/peepmatic.rs"
-"cranelift:area:x64":
- - "cranelift/codegen/src/machinst/**"
- - "cranelift/codegen/src/isa/x64/**"
-
"cranelift:docs":
- "cranelift/docs/**"
