[ARM] Remove t2xtpk features from tests

[samparker]

Summary

I previously removed the T2XtPk feature from the ARM backend, but it looks like I missed some of the tests that were using the feature.

[SjoerdMeijer]

Looks good to me.
I see that this feature was removed in D29623, but was still used here in these tests.
That should result in a compiler "t2xtpk is not a recognized feature for this target (ignoring feature)", but as it is a warning only, that is easily missed.

test/CodeGen/Thumb2/thumb2-pack.ll

-; RUN: llc -mtriple=thumb-eabi -mcpu=arm1156t2-s -mattr=+thumb2,+t2xtpk %s -o - | FileCheck %s
+; RUN: llc -mtriple=thumb-eabi -mcpu=arm1156t2-s -mattr=+thumb2 %s -o - | FileCheck %s
 
 ; CHECK: test1
 ; CHECK: pkhbt   r0, r0, r1, lsl #16

test/CodeGen/Thumb2/thumb2-rev.ll

-; RUN: llc -mtriple=thumb-eabi -mcpu=arm1156t2-s -mattr=+thumb2,+v7,+t2xtpk %s -o - | FileCheck %s
+; RUN: llc -mtriple=thumb-eabi -mcpu=arm1156t2-s -mattr=+thumb2,+v7 %s -o - | FileCheck %s
 
 define i32 @f1(i32 %a) {
 ; CHECK-LABEL: f1:

test/CodeGen/Thumb2/thumb2-smla.ll

-; RUN: llc -mtriple=thumb-eabi -mcpu=arm1156t2-s -mattr=+thumb2,+t2xtpk,+dsp %s -o - | FileCheck %s
-; RUN: llc -mtriple=thumb-eabi -mcpu=arm1156t2-s -mattr=+thumb2,+t2xtpk,+dsp -arm-use-mulops=false %s -o - | FileCheck %s -check-prefix=NO_MULOPS
+; RUN: llc -mtriple=thumb-eabi -mcpu=arm1156t2-s -mattr=+thumb2,+dsp %s -o - | FileCheck %s
+; RUN: llc -mtriple=thumb-eabi -mcpu=arm1156t2-s -mattr=+thumb2,+dsp -arm-use-mulops=false %s -o - | FileCheck %s -check-prefix=NO_MULOPS
 
 define i32 @f3(i32 %a, i16 %x, i32 %y) {
 ; CHECK: f3

test/CodeGen/Thumb2/thumb2-smul.ll

-; RUN: llc -mtriple=thumb-eabi -mcpu=arm1156t2-s -mattr=+thumb2,+t2xtpk,+dsp %s -o - |  FileCheck %s
+; RUN: llc -mtriple=thumb-eabi -mcpu=arm1156t2-s -mattr=+thumb2,+dsp %s -o - |  FileCheck %s
 
 @x = weak global i16 0          ; <i16*> [#uses=1]
 @y = weak global i16 0          ; <i16*> [#uses=0]

test/MC/ARM/thumbv8m.s

 // RUN: not llvm-mc -triple=thumbv8m.main -show-encoding < %s 2>%t \
 // RUN:   | FileCheck --check-prefix=CHECK-MAINLINE --check-prefix=CHECK %s
 // RUN:     FileCheck --check-prefix=UNDEF-MAINLINE --check-prefix=UNDEF < %t %s
-// RUN: not llvm-mc -triple=thumbv8m.main -mattr=+dsp,+t2xtpk -show-encoding < %s 2>%t \
+// RUN: not llvm-mc -triple=thumbv8m.main -mattr=+dsp -show-encoding < %s 2>%t \
 // RUN:   | FileCheck --check-prefix=CHECK-MAINLINE_DSP --check-prefix=CHECK %s
 // RUN:     FileCheck --check-prefix=UNDEF-MAINLINE_DSP --check-prefix=UNDEF < %t %s
 

 // UNDEF: target does not support ARM mode
 .arm
 
-// And only +dsp,+t2xtpk has DSP and t2xtpk instructions
+// And only +dsp has DSP and instructions
 // UNDEF-BASELINE: error: instruction requires: arm-mode
 // UNDEF-MAINLINE: error: instruction requires: arm-mode
 // UNDEF-MAINLINE_DSP-NOT: error: instruction requires: