Rename the IntLiteral to SintLiteral.

This Cl clarifies that IntLiteral is a signed value, which matches with
the usage of UintLiteral.

Change-Id: Ic8f0e2382cb66eb6b09daed096886dcc55e6b0f0
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/22540
Reviewed-by: David Neto <dneto@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index 2adbf02..9570e28 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -248,8 +248,6 @@
     "src/ast/if_statement.h",
     "src/ast/import.cc",
     "src/ast/import.h",
-    "src/ast/int_literal.cc",
-    "src/ast/int_literal.h",
     "src/ast/kill_statement.cc",
     "src/ast/kill_statement.h",
     "src/ast/literal.cc",
@@ -274,6 +272,8 @@
     "src/ast/scalar_constructor_expression.h",
     "src/ast/set_decoration.cc",
     "src/ast/set_decoration.h",
+    "src/ast/sint_literal.cc",
+    "src/ast/sint_literal.h",
     "src/ast/statement.cc",
     "src/ast/statement.h",
     "src/ast/statement_condition.cc",
@@ -587,7 +587,6 @@
     "src/ast/identifier_expression_test.cc",
     "src/ast/if_statement_test.cc",
     "src/ast/import_test.cc",
-    "src/ast/int_literal_test.cc",
     "src/ast/kill_statement_test.cc",
     "src/ast/location_decoration_test.cc",
     "src/ast/loop_statement_test.cc",
@@ -597,6 +596,7 @@
     "src/ast/return_statement_test.cc",
     "src/ast/scalar_constructor_expression_test.cc",
     "src/ast/set_decoration_test.cc",
+    "src/ast/sint_literal_test.cc",
     "src/ast/struct_member_offset_decoration_test.cc",
     "src/ast/struct_member_test.cc",
     "src/ast/struct_test.cc",