[llgo] Roll gofrontend forward

Switch gofrontend to using go.googlesource.com, and
update to 81eb6a3f425b2158c67ee32c0cc973a72ce9d6be.

There are various changes required to update to the
go 1.5 runtime:

typemap.go is changed to accommodate the change in representation for equal/hash algorithms, and the removal of the zero value/type.
CMakeLists.txt is updated to add the build tree to the package search path, so internal packages, which are not installed, are found.
various files changes due to removal of __go_new_nopointers; the same change as in D11863, but with NoUnwindAttribute added to the added runtime functions which are called with "callOnly".
minor cleanups in ssa.go while investigating issues with unwinding/panic handling.

Differential Revisision: http://reviews.llvm.org/D15188

llvm-svn: 263536

1 files changed, 1 insertions, 5 deletions

diff --git a/llgo/third_party/gofrontend/libgo/go/syscall/libcall_linux.go b/llgo/third_party/gofrontend/libgo/go/syscall/libcall_linux.go
index d5bedd06aac..f0479eb02ee 100644
--- a/llgo/third_party/gofrontend/libgo/go/syscall/libcall_linux.go
+++ b/llgo/third_party/gofrontend/libgo/go/syscall/libcall_linux.go
@@ -223,7 +223,6 @@ func Getdents(fd int, buf []byte) (n int, err error) {
 	} else {
 		p = (*byte)(unsafe.Pointer(&_zero))
 	}
-	Entersyscall()
 	s := SYS_GETDENTS64
 	if s == 0 {
 		s = SYS_GETDENTS
@@ -233,7 +232,6 @@ func Getdents(fd int, buf []byte) (n int, err error) {
 	if n < 0 {
 		err = errno
 	}
-	Exitsyscall()
 	return
 }
 
@@ -329,6 +327,7 @@ func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err e
 	var soff Offset_t
 	var psoff *Offset_t
 	if offset != nil {
+		soff = Offset_t(*offset)
 		psoff = &soff
 	}
 	written, err = sendfile(outfd, infd, psoff, count)
@@ -410,6 +409,3 @@ func Unlinkat(dirfd int, path string) (err error) {
 
 //sys	Unshare(flags int) (err error)
 //unshare(flags _C_int) _C_int
-
-//sys	Ustat(dev int, ubuf *Ustat_t) (err error)
-//ustat(dev _dev_t, ubuf *Ustat_t) _C_int