nv50/ir: Initialize CodeEmitter members in constructor.

Fix defects reported by Coverity Scan.

uninit_member: Non-static class member code is not initialized in this constructor nor in any functions that it calls.
uninit_member: Non-static class member codeSize is not initialized in this constructor nor in any functions that it calls.
uninit_member: Non-static class member codeSizeLimit is not initialized in this constructor nor in any functions that it calls.
uninit_member: Non-static class member relocInfo is not initialized in this constructor nor in any functions that it calls.
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Part-of: <mesa/mesa!8569>

src/gallium/drivers/nouveau/codegen/nv50_ir_target.cpp

@@ -183,7 +183,8 @@ void Target::destroy(Target *targ)
    delete targ;
 }
 
-CodeEmitter::CodeEmitter(const Target *target) : targ(target), fixupInfo(NULL)
+CodeEmitter::CodeEmitter(const Target *target) : targ(target), code(NULL),
+   codeSize(0), codeSizeLimit(0), relocInfo(NULL), fixupInfo(NULL)
 {
 }