[dev.link] cmd/link: remove symbol.FuncInfo

It is no longer used. The only remaining use is in generating
Plan 9 debug info, which is already not supported.

Change-Id: Ia023d6f2fa7d57b97ba861ce464e2eec8ac2d1f5
Reviewed-on: https://go-review.googlesource.com/c/go/+/228142
Reviewed-by: Than McIntosh <thanm@google.com>

src/cmd/link/internal/ld/lib.go

@@ -2604,17 +2604,6 @@ func genasmsym(ctxt *Link, put func(*Link, *sym.Symbol, string, SymbolType, int6
 
 	for _, s := range ctxt.Textp {
 		put(ctxt, s, s.Name, TextSym, s.Value, s.Gotype)
-
-		locals := int32(0)
-		if s.FuncInfo != nil {
-			locals = s.FuncInfo.Locals
-		}
-		// NOTE(ality): acid can't produce a stack trace without .frame symbols
-		put(ctxt, nil, ".frame", FrameSym, int64(locals)+int64(ctxt.Arch.PtrSize), nil)
-
-		if s.FuncInfo == nil {
-			continue
-		}
 	}
 
 	if ctxt.Debugvlog != 0 || *flagN {

src/cmd/link/internal/sym/sizeof_test.go

@@ -21,7 +21,7 @@ func TestSizeof(t *testing.T) {
 		_32bit uintptr     // size on 32bit platforms
 		_64bit uintptr     // size on 64bit platforms
 	}{
-		{Symbol{}, 108, 176},
+		{Symbol{}, 104, 168},
 	}
 
 	for _, tt := range tests {

src/cmd/link/internal/sym/symbol.go

@@ -31,7 +31,6 @@ type Symbol struct {
 	File        string // actually package!
 	auxinfo     *AuxSymbol
 	Sect        *Section
-	FuncInfo    *FuncInfo
 	Unit        *CompilationUnit
 	// P contains the raw symbol data.
 	P []byte
@@ -519,29 +518,6 @@ func SortSub(l *Symbol) *Symbol {
 	return l
 }
 
-type FuncInfo struct {
-	Args        int32
-	Locals      int32
-	Pcsp        Pcdata
-	Pcfile      Pcdata
-	Pcline      Pcdata
-	Pcinline    Pcdata
-	Pcdata      []Pcdata
-	Funcdata    []*Symbol
-	Funcdataoff []int64
-	File        []*Symbol
-	InlTree     []InlinedCall
-}
-
-// InlinedCall is a node in a local inlining tree (FuncInfo.InlTree).
-type InlinedCall struct {
-	Parent   int32   // index of parent in InlTree
-	File     *Symbol // file of the inlined call
-	Line     int32   // line number of the inlined call
-	Func     string  // name of the function that was inlined
-	ParentPC int32   // PC of the instruction just before the inlined body (offset from function start)
-}
-
 type Pcdata struct {
 	P []byte
 }