cmd/compile: give function position on function-too-big error

Update #67916

Change-Id: Iec3603c136b30ff6f760783c175eeb7e6ce139ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/591675
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Keith Randall <khr@golang.org>

src/cmd/compile/internal/bitvec/bv.go

@@ -8,6 +8,7 @@ import (
 	"math/bits"
 
 	"cmd/compile/internal/base"
+	"cmd/internal/src"
 )
 
 const (
@@ -33,11 +34,11 @@ type Bulk struct {
 	nword int32
 }
 
-func NewBulk(nbit int32, count int32) Bulk {
+func NewBulk(nbit int32, count int32, pos src.XPos) Bulk {
 	nword := (nbit + wordBits - 1) / wordBits
 	size := int64(nword) * int64(count)
 	if int64(int32(size*4)) != size*4 {
-		base.Fatalf("NewBulk too big: nbit=%d count=%d nword=%d size=%d", nbit, count, nword, size)
+		base.FatalfAt(pos, "NewBulk too big: nbit=%d count=%d nword=%d size=%d", nbit, count, nword, size)
 	}
 	return Bulk{
 		words: make([]uint32, size),

src/cmd/compile/internal/liveness/arg.go

@@ -132,7 +132,7 @@ func ArgLiveness(fn *ir.Func, f *ssa.Func, pp *objw.Progs) (blockIdx, valueIdx m
 	}
 
 	nargs := int32(len(lv.args))
-	bulk := bitvec.NewBulk(nargs, int32(len(f.Blocks)*2))
+	bulk := bitvec.NewBulk(nargs, int32(len(f.Blocks)*2), fn.Pos())
 	for _, b := range f.Blocks {
 		be := &lv.be[b.ID]
 		be.livein = bulk.Next()

src/cmd/compile/internal/liveness/plive.go

@@ -431,7 +431,7 @@ func newliveness(fn *ir.Func, f *ssa.Func, vars []*ir.Name, idx map[*ir.Name]int
 
 	nblocks := int32(len(f.Blocks))
 	nvars := int32(len(vars))
-	bulk := bitvec.NewBulk(nvars, nblocks*7)
+	bulk := bitvec.NewBulk(nvars, nblocks*7, fn.Pos())
 	for _, b := range f.Blocks {
 		be := lv.blockEffects(b)