examples: Remove non-working #pragma unroll statements

These give the following message:

warning: loop not unrolled: the optimizer was unable to perform the
requested transformation; the transformation might be disabled or specified
as part of an unsupported transformation ordering
[-Wpass-failed=transform-warning]

Author: evan-charmworks

examples/charm++/load_balancing/stencil3d/stencil3d.C

@@ -323,9 +323,6 @@ class Stencil: public CBase_Stencil {
       } else
         work = 10.0;
 
-#ifndef _MSC_VER
-#pragma unroll
-#endif
       for(int w=0; w<work; w++) {
         for(int k=1; k<blockDimZ+1; ++k)
           for(int j=1; j<blockDimY+1; ++j)

examples/charm++/zerocopy/entry_method_api/prereg/stencil3d/stencil3d.C

@@ -343,9 +343,6 @@ class Stencil: public CBase_Stencil {
       } else
         work = 10.0;
 
-#ifndef _MSC_VER
-#pragma unroll
-#endif
       for(int w=0; w<work; w++) {
         for(int k=1; k<blockDimZ+1; ++k)
           for(int j=1; j<blockDimY+1; ++j)

examples/charm++/zerocopy/entry_method_api/reg/stencil3d/stencil3d.C

@@ -363,9 +363,6 @@ class Stencil: public CBase_Stencil {
       } else
         work = 10.0;
 
-#ifndef _MSC_VER
-#pragma unroll
-#endif
       for(int w=0; w<work; w++) {
         for(int k=1; k<blockDimZ+1; ++k)
           for(int j=1; j<blockDimY+1; ++j)

examples/charm++/zerocopy/entry_method_api/unreg/stencil3d/stencil3d.C

@@ -344,9 +344,6 @@ class Stencil: public CBase_Stencil {
       } else
         work = 10.0;
 
-#ifndef _MSC_VER
-#pragma unroll
-#endif
       for(int w=0; w<work; w++) {
         for(int k=1; k<blockDimZ+1; ++k)
           for(int j=1; j<blockDimY+1; ++j)