Revert "cmd/compile, cmd/link, runtime: make defers low-cost through inline code and extra funcdata"

This reverts CL 190098.

Reason for revert: broke several builders.

Change-Id: I69161352f9ded02537d8815f259c4d391edd9220
Reviewed-on: https://go-review.googlesource.com/c/go/+/201519
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Dan Scales <danscales@google.com>

1 files changed, 2 insertions, 10 deletions

diff --git a/src/cmd/compile/internal/ssa/func.go b/src/cmd/compile/internal/ssa/func.go
index 332e201899..cdd5161913 100644
--- a/src/cmd/compile/internal/ssa/func.go
+++ b/src/cmd/compile/internal/ssa/func.go
@@ -32,16 +32,8 @@ type Func struct {
 	Type   *types.Type // type signature of the function.
 	Blocks []*Block    // unordered set of all basic blocks (note: not indexable by ID)
 	Entry  *Block      // the entry basic block
-
-	// If we are using open-coded defers, this is the first call to a deferred
-	// function in the final defer exit sequence that we generated. This call
-	// should be after all defer statements, and will have all args, etc. of
-	// all defer calls as live. The liveness info of this call will be used
-	// for the deferreturn/ret segment generated for functions with open-coded
-	// defers.
-	LastDeferExit *Value
-	bid           idAlloc // block ID allocator
-	vid           idAlloc // value ID allocator
+	bid    idAlloc     // block ID allocator
+	vid    idAlloc     // value ID allocator
 
 	// Given an environment variable used for debug hash match,
 	// what file (if any) receives the yes/no logging?