Remove invalid assert.

Subzero x86-64 call instruction operands can be 64-bit now and require
a register.

Bug chromium:860533

Change-Id: I4446be34f57ef73e24718252210bdaa81995c8be
Reviewed-on: https://swiftshader-review.googlesource.com/19848
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Corentin Wallez <cwallez@google.com>

third_party/subzero/src/IceTargetLoweringX86BaseImpl.h

diff --git a/third_party/subzero/src/IceTargetLoweringX86BaseImpl.h b/third_party/subzero/src/IceTargetLoweringX86BaseImpl.h
index f2fd83e..c63a6e6 100644
--- a/third_party/subzero/src/IceTargetLoweringX86BaseImpl.h
+++ b/third_party/subzero/src/IceTargetLoweringX86BaseImpl.h
@@ -7997,9 +7997,8 @@
     // - Mem is not allowed and Var isn't guaranteed a physical register, or
     // - RegNum is required and Var->getRegNum() doesn't match, or
     // - Var is a rematerializable variable and rematerializable pass-through is
-    //   not allowed (in which case we need an lea instruction).
+    //   not allowed (in which case we need a lea instruction).
     if (MustRematerialize) {
-      assert(Ty == IceType_i32);
       Variable *NewVar = makeReg(Ty, RegNum);
       // Since Var is rematerializable, the offset will be added when the lea is
       // emitted.