C backend: basic big ints, fix airPtrToInt, array references, pointer arithmetic UB with NULL, implement airPtrElemPtr/Val, fix redundant indirection/references with arrays

-add additional test cases that were found to be passing
-add basic int128 test cases which previously did not pass but weren't covered
-most test cases in cast.zig now pass
-i128/u128 or smaller int constants can now be rendered
-unsigned int constants are now always suffixed with 'u' to prevent random compile errors
-pointers with a val tag of 'zero' now just emit a 0 constant which coerces to the pointer type and fixes some warnings with ordered comparisons
-pointers with a val tag of 'one' are now casted back to the pointer type
-support pointers with a u64 val
-fix bug where rendering an array's type will emit more indirection than is needed
-render uint128_t/int128_t manually when needed
-implement ptr_add/sub AIR handlers manually so they manually cast to int types which avoids UB if the result or ptr operand is NULL
-implement airPtrElemVal/Ptr
-airAlloc for arrays will not allocate a ref as the local for the array is already a reference/pointer to the array itself
-fix airPtrToInt by casting to the int type

1 files changed, 5 insertions, 4 deletions

diff --git a/test/behavior.zig b/test/behavior.zig
index 7cdb8386bc..0abc15035b 100644
--- a/test/behavior.zig
+++ b/test/behavior.zig
@@ -2,6 +2,7 @@ const builtin = @import("builtin");
 
 test {
     // Tests that pass for stage1, stage2, and the C backend.
+    _ = @import("behavior/align.zig");
     _ = @import("behavior/basic.zig");
     _ = @import("behavior/bitcast.zig");
     _ = @import("behavior/bool.zig");
@@ -19,16 +20,18 @@ test {
     _ = @import("behavior/bugs/4769_b.zig");
     _ = @import("behavior/bugs/6850.zig");
     _ = @import("behavior/call.zig");
+    _ = @import("behavior/cast_c.zig");
     _ = @import("behavior/defer.zig");
     _ = @import("behavior/enum.zig");
     _ = @import("behavior/hasdecl.zig");
     _ = @import("behavior/hasfield.zig");
     _ = @import("behavior/if.zig");
-    _ = @import("behavior/struct.zig");
-    _ = @import("behavior/truncate.zig");
+    _ = @import("behavior/int128.zig");
     _ = @import("behavior/null.zig");
+    _ = @import("behavior/pointers.zig");
     _ = @import("behavior/ptrcast.zig");
     _ = @import("behavior/pub_enum.zig");
+    _ = @import("behavior/struct.zig");
     _ = @import("behavior/truncate.zig");
     _ = @import("behavior/underscore.zig");
     _ = @import("behavior/usingnamespace.zig");
@@ -39,7 +42,6 @@ test {
 
     if (builtin.object_format != .c) {
         // Tests that pass for stage1 and stage2 but not the C backend.
-        _ = @import("behavior/align.zig");
         _ = @import("behavior/array.zig");
         _ = @import("behavior/atomics.zig");
         _ = @import("behavior/basic_llvm.zig");
@@ -60,7 +62,6 @@ test {
         _ = @import("behavior/maximum_minimum.zig");
         _ = @import("behavior/null_llvm.zig");
         _ = @import("behavior/optional.zig");
-        _ = @import("behavior/pointers.zig");
         _ = @import("behavior/popcount.zig");
         _ = @import("behavior/saturating_arithmetic.zig");
         _ = @import("behavior/sizeof_and_typeof.zig");