cmd/compile: remove 8-byte alignment requirement of stack slot on mips

This CL applies CL 267999 to mips.

Updates #42385

Change-Id: I8096e16c1b4def767b0c20c16add36fa2406bcab
Reviewed-on: https://go-review.googlesource.com/c/go/+/297772
Reviewed-by: Keith Randall <khr@golang.org>
Trust: eric fang <eric.fang@arm.com>
diff --git a/src/cmd/compile/internal/ssagen/pgen.go b/src/cmd/compile/internal/ssagen/pgen.go
index 717f111..9b81d14 100644
--- a/src/cmd/compile/internal/ssagen/pgen.go
+++ b/src/cmd/compile/internal/ssagen/pgen.go
@@ -138,7 +138,7 @@
 		} else {
 			lastHasPtr = false
 		}
-		if Arch.LinkArch.InFamily(sys.MIPS, sys.ARM, sys.ARM64, sys.PPC64, sys.S390X) {
+		if Arch.LinkArch.InFamily(sys.ARM, sys.ARM64, sys.PPC64, sys.S390X) {
 			s.stksize = types.Rnd(s.stksize, int64(types.PtrSize))
 		}
 		n.SetFrameOffset(-s.stksize)