gpu-compute: Stop passing in a default value to resize().

A default constructed element of the container is the default value to
the second resize() parameter. Having that parameter explicitly causes a
warning/error in newer versions of gcc, and is unnecessary regardless.

Change-Id: I6aee2d23f0f4382b00caf552c8e38940614c5f9a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/60311
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Reviewed-by: Yu-hsin Wang <yuhsingw@google.com>

src/gpu-compute/vector_register_file.cc

@@ -48,7 +48,7 @@ namespace gem5
 VectorRegisterFile::VectorRegisterFile(const VectorRegisterFileParams &p)
     : RegisterFile(p)
 {
-    regFile.resize(numRegs(), VecRegContainer());
+    regFile.resize(numRegs());
 
     for (auto &reg : regFile) {
         reg.zero();