cmd/compile: fix wrong dict param when getting dict type

CL 338129 added getDictionaryType to get the dictionary type from the
specified dict param, but still using the one in info.dictParam, which
is wrong.

Fixes #51413

Change-Id: Ie13460c1e5751c4c5fc44479a44f6eed8b3b06e4
Reviewed-on: https://go-review.googlesource.com/c/go/+/391994
Trust: Cuong Manh Le <[email protected]>
Run-TryBot: Cuong Manh Le <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Matthew Dempsky <[email protected]>
Trust: Matthew Dempsky <[email protected]>
Reviewed-by: Keith Randall <[email protected]>

Author: cuonglm

src/cmd/compile/internal/noder/stencil.go

@@ -898,7 +898,7 @@ func getDictionaryType(info *instInfo, dictParam *ir.Name, pos src.XPos, i int)
 		base.Fatalf(fmt.Sprintf("bad dict index %d", i))
 	}
 
-	r := getDictionaryEntry(pos, info.dictParam, i, info.dictInfo.startSubDict)
+	r := getDictionaryEntry(pos, dictParam, i, info.dictInfo.startSubDict)
 	// change type of retrieved dictionary entry to *byte, which is the
 	// standard typing of a *runtime._type in the compiler
 	typed(types.Types[types.TUINT8].PtrTo(), r)

test/typeparam/mdempsky/13.go

@@ -1,4 +1,4 @@
-// run -gcflags=""
+// run
 
 // Copyright 2021 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style