gnu-efi: fix lib/ia64/setjmp.S IA-64 build failure

The build failed as:
  lib/ia64/setjmp.S:171: Error: Unknown opcode `ldf.nt1 f26=[r10],8'
  lib/ia64/setjmp.S:178: Error: Operand 1 of `ldf.fill.nt1' should be a floating-point register

The change syncs longjmp definition with
    edk2/EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/Ipf/setjmp.s
pulling in:
- branch in the end of function
- registers used wrong instruction for float restore

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

lib/ia64/setjmp.S

@@ -16,7 +16,7 @@ BASIS,
 	.globl	setjmp
 	.type	setjmp, @function
 setjmp:
-	alloc	loc = ar.pfs, 1, 2, 1, 0
+	alloc	loc0 = ar.pfs, 1, 2, 1, 0
 	;;
 	mov	r14 = ar.unat
 	mov	r15 = ar.bsp
@@ -98,10 +98,10 @@ setjmp:
 
 	.globl	longjmp
 	.type	longjmp, @function
-	.regstk
+	.regstk 2, 0, 0, 0
 longjmp:
 	add		r10 = 0x10*20 + 8*14, in0
-	movl		r2 = ~(((1<<14) - 1) << 16) | 3)
+	movl		r2  = ~((((1<<14) - 1) << 16) | 3)
 	;;
 	ld8.nt1		r14 = [r10], -8*2
 	mov		r15 = ar.bspstore
@@ -120,10 +120,6 @@ longjmp:
 	;;
 	mov		ar.rsc = r2
 	ld8.nt1		r23 = [r10], -8
-	mov		b5 = r25
-	;;
-	mov		ar.rsc = r2
-	ld8.nt1		r23 = [r10], -8
 	mov		b4 = r24
 	;;
 	ldf.fill.nt1	f3 = [in0], 0x10
@@ -142,8 +138,8 @@ _skip_flushrs:
 	dep		r2  = -1, r14, 3, 6
 	;;
 	ldf.fill.nt1	f5  = [in0], 0x10
-	ld8.nt1		f21 = [r10], -8
-	cmp		p6 = r2, r15
+	ld8.nt1		r21 = [r10], -8
+	cmp.ltu		p6  = r2, r15
 	;;
 	ld8.nt1		r20 = [r10], -0x10
 (p6)	ld8.nta		r31 = [r2]
@@ -168,14 +164,14 @@ _skip_flushrs:
 	ld8.nt1		r19 = [r10], 0x10
 	;;
 	ldf.fill.nt1	f21 = [in0], 0x10
-	ldf.nt1		f26 = [r10], 8
+	ld8.nt1		r26 = [r10], 8
 	mov		ar.pfs = r19
 	;;
 	ldf.fill.nt1	f22 = [in0], 0x10
 	ld8.nt1		r27 = [r10], 8
 	mov		pr  = r26, -1
 	;;
-	ldf.fill.nt1	r23 = [in0], 0x10
+	ldf.fill.nt1	f23 = [in0], 0x10
 	ld8.nt1		r28 = [r10], -17*8 - 0x10
 	mov		ar.lc = r27
 	;;
@@ -198,3 +194,6 @@ _skip_flushrs:
 	mov		ar.bspstore = r14
 	mov		ar.rnat = r31
 	;;
+	invala
+	mov		ar.rsc = r16
+	br.ret.sptk	b0