Fix crashes on ARM6T2+ when OS_Byte/OS_Word are used from IRQ mode

Detail:
  s/Kernel - A bug introduced when adding the BFI optimisations meant that NoIrqVecSwiDespatch was enabling IRQs instead of disabling them, leading to lr_irq corruption and a potential crash if the SWIs were used from IRQ mode
Admin:
  Tested on rev A2 BB-xM
  Having KeyExtend loaded no longer causes random crashes during keyboard input
  Fixes issue reported on forums: http://www.riscosopen.org/forum/forums/4/topics/1024#posts-12004


Version 5.35, 4.79.2.148. Tagged as 'Kernel-5_35-4_79_2_148'

VersionASM

@@ -13,11 +13,11 @@
                         GBLS    Module_ComponentPath
 Module_MajorVersion     SETS    "5.35"
 Module_Version          SETA    535
-Module_MinorVersion     SETS    "4.79.2.147"
-Module_Date             SETS    "26 Apr 2012"
-Module_ApplicationDate  SETS    "26-Apr-12"
+Module_MinorVersion     SETS    "4.79.2.148"
+Module_Date             SETS    "15 May 2012"
+Module_ApplicationDate  SETS    "15-May-12"
 Module_ComponentName    SETS    "Kernel"
 Module_ComponentPath    SETS    "castle/RiscOS/Sources/Kernel"
-Module_FullVersion      SETS    "5.35 (4.79.2.147)"
-Module_HelpVersion      SETS    "5.35 (26 Apr 2012) 4.79.2.147"
+Module_FullVersion      SETS    "5.35 (4.79.2.148)"
+Module_HelpVersion      SETS    "5.35 (15 May 2012) 4.79.2.148"
                         END

VersionNum

@@ -5,19 +5,19 @@
  *
  */
 #define Module_MajorVersion_CMHG        5.35
-#define Module_MinorVersion_CMHG        4.79.2.147
-#define Module_Date_CMHG                26 Apr 2012
+#define Module_MinorVersion_CMHG        4.79.2.148
+#define Module_Date_CMHG                15 May 2012
 
 #define Module_MajorVersion             "5.35"
 #define Module_Version                  535
-#define Module_MinorVersion             "4.79.2.147"
-#define Module_Date                     "26 Apr 2012"
+#define Module_MinorVersion             "4.79.2.148"
+#define Module_Date                     "15 May 2012"
 
-#define Module_ApplicationDate          "26-Apr-12"
+#define Module_ApplicationDate          "15-May-12"
 
 #define Module_ComponentName            "Kernel"
 #define Module_ComponentPath            "castle/RiscOS/Sources/Kernel"
 
-#define Module_FullVersion              "5.35 (4.79.2.147)"
-#define Module_HelpVersion              "5.35 (26 Apr 2012) 4.79.2.147"
+#define Module_FullVersion              "5.35 (4.79.2.148)"
+#define Module_HelpVersion              "5.35 (15 May 2012) 4.79.2.148"
 #define Module_LibraryVersionInfo       "5:35"

s/Kernel

@@ -1508,7 +1508,7 @@ NoIrqVecSwiDespatch ROUT
         ORR     r11, r11, r14           ; add in CCs
       |
         MOV     r14, r14, LSR #28
-        BIC     r11, r11, #I32_bit      ; enable IRQs
+        ORR     r11, r11, #I32_bit      ; disable IRQs
         BFI     r11, r14, #28, #4       ; add in caller's CCs
       ]
         MSR     CPSR_cf, r11            ; and set it all up