Change RenderScriptx86ABIFixups.cpp to use llvm::AttributeList iterator

[xiaobai]

Summary

LLVM::AttributeList recently had getNumSlots() removed, which broke the build. This fixes the build using functions introduced in the
update to LLVM::AttributeList.

[xiaobai]

Committed by @sas with sha1 hash 12538988d96eb651256e27c9c310f1b7ea1babd6

source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptx86ABIFixups.cpp

for (auto call_inst : rs_callsites) {
     // add the called function to a set so that we can strip its byval
     // attributes in another pass
     rs_functions.insert(call_inst->getCalledFunction());
 
     // get the function attributes
     llvm::AttributeList call_attribs = call_inst->getAttributes();
 
     // iterate over the argument attributes
-    for (size_t i = 1; i <= call_attribs.getNumSlots(); ++i) {
+    for (unsigned I = call_attribs.index_begin(); I != call_attribs.index_end();
+         I++) {
       // if this argument is passed by val
       if (call_attribs.hasAttribute(i, llvm::Attribute::ByVal)) {
         // strip away the byval attribute
         call_inst->removeAttribute(i, llvm::Attribute::ByVal);
         changed = true;
       }
     }
   }