builder: remove non-ThinLTO build mode

All targets now support ThinLTO so let's remove the old unused code.

transform/globals.go

@@ -1,20 +0,0 @@
-package transform
-
-import "tinygo.org/x/go-llvm"
-
-// This file implements small transformations on globals (functions and global
-// variables) for specific ABIs/architectures.
-
-// ApplyFunctionSections puts every function in a separate section. This makes
-// it possible for the linker to remove dead code. It is the equivalent of
-// passing -ffunction-sections to a C compiler.
-func ApplyFunctionSections(mod llvm.Module) {
-	llvmFn := mod.FirstFunction()
-	for !llvmFn.IsNil() {
-		if !llvmFn.IsDeclaration() && llvmFn.Section() == "" {
-			name := llvmFn.Name()
-			llvmFn.SetSection(".text." + name)
-		}
-		llvmFn = llvm.NextFunction(llvmFn)
-	}
-}

transform/globals_test.go

@@ -1,15 +0,0 @@
-package transform_test
-
-import (
-	"testing"
-
-	"github.com/tinygo-org/tinygo/transform"
-	"tinygo.org/x/go-llvm"
-)
-
-func TestApplyFunctionSections(t *testing.T) {
-	t.Parallel()
-	testTransform(t, "testdata/globals-function-sections", func(mod llvm.Module) {
-		transform.ApplyFunctionSections(mod)
-	})
-}

transform/testdata/globals-function-sections.ll

@@ -1,8 +0,0 @@
-target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
-target triple = "armv7em-none-eabi"
-
-declare void @foo()
-
-define void @bar() {
-  ret void
-}

transform/testdata/globals-function-sections.out.ll

@@ -1,8 +0,0 @@
-target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
-target triple = "armv7em-none-eabi"
-
-declare void @foo()
-
-define void @bar() section ".text.bar" {
-  ret void
-}