Zend/asm: adjust XCOFF64 asm files for AIX assembler

AIX assembler is a bit more strict than GNU assembler. Thus, adjust
the XCOFF asm files to be able to accept both assembler.

Zend/asm/jump_ppc64_sysv_xcoff_gas.S

@@ -6,8 +6,16 @@
           http://www.boost.org/LICENSE_1_0.txt)
 */
 
-.align 2
-.globl .jump_fcontext
+    .file "jump_ppc64_sysv_xcoff_gas.S"
+    .toc
+    .csect .text[PR], 5
+    .align 2
+    .globl  jump_fcontext[DS]
+    .globl .jump_fcontext
+    .csect  jump_fcontext[DS], 3
+jump_fcontext:
+    .llong .jump_fcontext[PR], TOC[tc0], 0
+    .csect .text[PR], 5
 .jump_fcontext:
     # reserve space on stack
     subi  1, 1, 184
@@ -27,7 +35,7 @@
     std  25, 96(1)  # save R25
     std  26, 104(1)  # save R26
     std  27, 112(1)  # save R27
-    std  29, 120(1)  # save R28
+    std  28, 120(1)  # save R28
     std  29, 128(1)  # save R29
     std  30, 136(1)  # save R30
     std  31, 144(1)  # save R31

Zend/asm/make_ppc64_sysv_xcoff_gas.S

@@ -4,12 +4,17 @@
       (See accompanying file LICENSE_1_0.txt or copy at
           http://www.boost.org/LICENSE_1_0.txt)
 */
-	.globl	make_fcontext[DS]
-	.globl .make_fcontext[PR]
-	.align 2 
-	.csect .make_fcontext[PR], 3
-	.globl _make_fcontext
-#._make_fcontext:
+    .file "make_ppc64_sysv_xcoff_gas.S"
+    .toc
+    .csect .text[PR], 5
+    .align 2
+    .globl  make_fcontext[DS]
+    .globl .make_fcontext
+    .csect  make_fcontext[DS], 3
+make_fcontext:
+    .llong .make_fcontext[PR], TOC[tc0], 0
+    .csect .text[PR], 5
+.make_fcontext:
     # save return address into R6
     mflr  6