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[PowerPC] Fix shift amount of xxsldwi when performing vector int_to_double
POC
```
// main.c
#include <stdio.h>
#include <altivec.h>
extern vector double foo(vector int s);
int main() {
vector int s = {0, 1, 0, 4};
vector double vd;
vd = foo(s);
printf("%lf %lf\n", vd[0], vd[1]);
return 0;
}
// poc.c
vector double foo(vector int s) {
int x1 = s[1];
int x3 = s[3];
double d1 = x1;
double d3 = x3;
vector double x = { d1, d3 };
return x;
}
```
Compiled with `poc.c main.c -mcpu=pwr8 -O3` on BE machine.
Current clang gives
```
4.000000 1.000000
```
while xlc gives
```
1.000000 4.000000
```
Xlc's output should be correct.
Reviewed By: shchenz, #powerpc
Differential Revision: https://reviews.llvm.org/D107428